fix migration coverage for build

InvenTree/build/migrations/0013_auto_20200425_0507.py

@@ -11,7 +11,7 @@ def update_tree(apps, schema_editor):
     Build.objects.rebuild()
 
 
-def nupdate_tree(apps, schema_editor):
+def nupdate_tree(apps, schema_editor):  # pragma: no cover
     pass
 
 

InvenTree/build/migrations/0029_auto_20210601_1525.py

@@ -23,7 +23,7 @@ def assign_bom_items(apps, schema_editor):
     count_valid = 0
     count_total = 0
 
-    for build_item in BuildItem.objects.all():
+    for build_item in BuildItem.objects.all():  # pragma: no cover
 
         # Try to find a BomItem which matches the BuildItem
         # Note: Before this migration, variant stock assignment was not allowed,
@@ -45,11 +45,11 @@ def assign_bom_items(apps, schema_editor):
         except BomItem.DoesNotExist:
             pass
 
-    if count_total > 0:
+    if count_total > 0:  # pragma: no cover
         logger.info(f"Assigned BomItem for {count_valid}/{count_total} entries")
 
 
-def unassign_bom_items(apps, schema_editor):
+def unassign_bom_items(apps, schema_editor):  # pragma: no cover
     """
     Reverse migration does not do anything.
     Function here to preserve ability to reverse migration

InvenTree/build/migrations/0032_auto_20211014_0632.py

@@ -21,13 +21,13 @@ def build_refs(apps, schema_editor):
         if result and len(result.groups()) == 1:
             try:
                 ref = int(result.groups()[0])
-            except:
+            except:  # pragma: no cover
                 ref = 0
 
         build.reference_int = ref
         build.save()
 
-def unbuild_refs(apps, schema_editor):
+def unbuild_refs(apps, schema_editor):  # pragma: no cover
     """
     Provided only for reverse migration compatibility
     """